酸的强度由其提供质子的能力来衡量，碱的强度由其接受质子的能力来衡量。

最伟大的科学家是那些永不停止学习的人。

The deepest need of man is the need to overcome his separateness, to leave the prison of his aloneness.

没有无聊的主题，只有无聊的作家。

A work of art is a work of art because it's called a work of art.

The only limit to our realization of tomorrow will be our doubts of today.

粮食安全是一个需要地方行动的全球性问题。